基于可调谐半导体激光吸收光谱的酒精蒸汽检测方法

Ethanol vapor measurement based on tunable diode laser absorption spectroscopy

采用窄带半导体激光器开展了酒精蒸汽浓度检测方法研究.使用酒精分子在7180 cm-1附近的一个相对较窄的吸收峰作为酒精分子的鉴别信息.为消除水汽对酒精分子检测的干扰,提出了建立多元线性回归方程拟合求解多分子吸收共存的问题.实验表明,系统的检测限达到25 ppm·m.

A method of detecting ethanol vapor concentration using a narrow bandwidth tunable diode laser is studied. The relatively narrow absorption feature in the vicinity of 7180 cm-1 is used as an identification of ethanol vapor. To eliminate the interference of water vapor, multidimensional linear regression analysis is used to solve the problem of multiple molecule absorptions. The detection limit is obtained to be 25 ppm.m experimentally.